About one percent of people can hear the Hum and a very fraction of these hear the Hum at extreme levels. Measurements of the Hum energy show small variations at various times of the day and night but theses cannot account for the extreme changes in Hum level experienced by some sufferers. There is a missing factor which I believe involves resonance. In the early days of radio a method used to increase the output and sensitivity of a radio receiver was to feed a small part of the output back to the aerial circuit, this was known as reactance. However, if too much reactance was applied the radio receiver became a radio transmitter much to the annoyance of all in the vicinity. Using a simple Hum detector I have applied the same principle and found it possible to produce a very sharp resonance curve. If this same process takes place within the human brain, then for some individuals a small change in Hum frequency will result in huge changes in the perceived Hum level, if the principle of reaction also takes place within the human brain, the individual will hear the Hum at an appalling level that no one else can hear, and as has happened in the past, sufficient to cause suicide.
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